The first semester of junior high school geometry training question 1, if the line segment AB=7.2cm, point C is on AB, point AC=3 1AB, and point M is the midpoint of AB, then the length of MC is _ _ _ _ _ _ .2. Given the line segment AB and its upper point C, draw the midpoint D of line segment AC and the midpoint E of line segment BC. _ _ _ _ _ _ 3. Given a line segment AB, draw its midpoint C, then draw the midpoint D of BC, and then draw the midpoint E of AD, then AE is equal to a fraction of AB. _ _ _ _ _ _ _ 4. Given the line segment MN, take a point P on the extension line of MN to make MP=2NP, and then take a point Q on the reverse extension line of MN to make MQ=2MN. Which part of NQ line segment is MP? _ _ _ _ _ _ _ 5. Given the line segment AB and its upper point C, draw the midpoint D of the line segment AC and the midpoint E of the line segment BC, then DE is a fraction of AB? _ _ _ _ _ _ _ 6, the known line segment MN = 10 cm, the point P is on the straight line MN, MP=4.5cm, and the point S is the midpoint of PN, so the length of the line segment PS is _ _ _ _ _ _ _ cm.7, and the known lines A, B, C and D are four in turn on the straight line L. If Mn = A ANd BN = B, then the length of an is _ _ _ _ _ _ _.

There are many more, but the drawings can't be sent. You can go to Baidu Library. 4. Wen Ku's mathematics and geometry problems. Baidu/View/9D2039333 1126EDB6F1a102C,1. Cut the square into a plane figure. Not piece by piece! .

Seven knives!

Three knives on each side and one knife in the middle! * * * Seven knives! 0, outside the square ABGF and ACDE △ABC discusses the relationship between be and FC.

5. As shown in figure 1, the light oc and OD are within ∠AOB, and ∠ AOB = 150, ∠ OC, OD = 30. Ray OM and ON share ∠AOD∠AOD∠ BOC equally. They are.

(1) If ∠ AOC = 60, try to compare ∠NOD and ∠ MOC by calculation;

(2) As shown in Figure 2, if ∠COD in Figure 1 rotates clockwise around ∠ O point in ∠AOB.

① The size of ∠ mon remains the same during rotation. Find the value of ∠MON;

② As shown in Figure 3, if OC happens to be the bisector of ∠MOA after rotation, try to explore the quantitative relationship between ∠NOD and ∠MOC.

0,0, It is very difficult to solve the math and geometry problems in the first volume of Grade One, and the harder the better.

It's particularly difficult, but it must start from the first grade.